Study on the Residual Digestion Characteristics of Cypermethrin in Cucumbers
To find out the deposition differences of residual organochlorine pesticides influenced by the cultivation conditions and climate microenvironment,a randomized block experiment was used to investigate the residual digestion characteristics of 4.5%cypermethrin in 1 600-fold and 800-fold solutions in cucumbers under facility and open field conditions.The experimental results indicated that the initial deposition of 4.5%efficient cypermethrin emulsifiable concentrate(1 600-fold and 800-fold solutions)on the stems and leaves of cucumber grown in open fields and facilities varied greatly.The higher the concentration,the higher the initial deposition was.After 5 and 7 days of spraying in the open field condition and 5 days after spraying in the sunlight greenhouse,the residual amount decreased to the MRL value,meeting the 7-day safety interval standard and the quality and safety of vegetables.The degradation time required for the residual amount to degrade to the maximum limit standard value after spraying at two doses was 3.8 days and 4.7 days for open field cultivation,and 3.0 days and 4.2 days for sunlight greenhouse cultivation,respectively.Therefore,4.5%efficient cypermethrin emulsifiable concentrate could be applied to vegetables in 1 600-fold or 800-fold solution.
Green houseopen fieldCucumberCypermethrinResidue digestion
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